johnnytcpa Posted July 23, 2023 Share Posted July 23, 2023 This should be a quick question. I plan to have 1 ZFS SSD Pool with 1 parity to permanently store [appdata, VMs, SMB, etc] in FAST storage and another cache pool for regular media downloading and anything else that will be moved to array. I have the following SSDs with the following endurance (TBW) 2X 2TB SN850X Gen 4 SSD @ 1200TBW 2TB SN850 Gen 4 SSD @ 1200TBW 2TB Intel 670p Gen3 SSD @ 740 TBW Since the Intel 670p has lower write endurance (and much lower speeds) than the other 3 drives I have, which would be the best configuration (examples below). Option 1: ZFS RaidZ1 pool: 2x SN850X w/ SN850 as parity AND Cache Drive: Intel 670p Option 2: ZFS RaidZ1 pool: 2x SN850X w/ Intel 670p as parity AND Cache Drive: SN850 Option 3: ZFS RaidZ1 pool: SN850X + SN850 w/ SN850X as parity AND Cache Drive: Intel 670p Quote Link to comment
itimpi Posted July 23, 2023 Share Posted July 23, 2023 I think you have misunderstood how ZFS works. In ZFS pools the parity information is striped across the drives in the pool and not to a dedicated parity drive. Quote Link to comment
johnnytcpa Posted July 25, 2023 Author Share Posted July 25, 2023 On 7/23/2023 at 3:25 PM, itimpi said: I think you have misunderstood how ZFS works. In ZFS pools the parity information is striped across the drives in the pool and not to a dedicated parity drive. Thanks. I am new to ZFS/RAID. I was basing my basic understanding on RAIDZ5 and assumed ZFS works similarly. In a sense, if I don't dedicate a parity drive in my ZFS pool, would that mean it will automatically run at the slowest speed drive (SN850)? Quote Link to comment
JorgeB Posted July 31, 2023 Share Posted July 31, 2023 If you create a ZFS raidz pool (and not use the devices in the array) the pool speed will be limited by the slowest device. Quote Link to comment
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